I agree, the handle shape that Queen calls a "copperhead", similar to the one made by several Solingen companies, resembles a scaled-down version of the classic 2 blade "folding hunter" as exemplified by the Queen #39 or the Case 6265. I believe that Queen only makes it as a single blade now.
On the other hand....Case used to make the 6249 pattern, referred to as the "Copperhead".....this was a 4" 2-blade jack pattern, clip and pen blades, extension bolster at the blade end.....the pattern that helped to inspire the "Copperlock" in the Case line.
So the only common feature is the extension bolster....why that gives it the name "Copperhead", I have no idea.